826 MR. J. lUTCllIE 0\ UYDItOIUS [M:iy 24, 



4. liydroids from ( "liristmas fslaiKl. Indian Oooan, collectod 

 by V. AV. Andrews, D.8c., FAl.i>., F.Z.8., in IDOM. By 

 James Ritchie, M.A., B.Sc, Natural History Dopart- 

 nieiit, Tlio Royal Scottish Museum*. 



[Received A|)iil 28, 1910.] 



(Text-figui-e.s80i.fe81). 



The present paper give.s account of a small collection of 

 liydroids which formed })art of the Marine Invertebrate 

 collections obtained by Dr. Andrews during the autunni of 1908. 

 The smallness of the collection, howevei', is hardly to be taken 

 as an indication of the poverty of the Hydroid fauna of the 

 Island, for Dr. Andrews found that, at virtually all points, shore- 

 collecting was dangerous or impossi])le. The present specimens, 

 therefore, were obtained in a limited area : in Flying Fish Cove, 

 either on the shore, or on a reef laid bare at low tide. 



The collection is of interest as being a first sample of the 

 Hydroid fauna of this isolated island ; and in spite of its 

 limitation, for it contains representatives of only thirteen species, 

 it adds four of these to the known fauna of the Indian Ocean. 

 The mo.st remarkable of the.se additions are hydrantlis wiiich 

 exactly correspond with those of Rhizo(/etoii nudum, described by 

 Jiroch, in 1909, from Spitsbergen. 



I have to tliank Mr. R. Kirkpatrick, of the British IMuseum, 

 for giving me the opportunity of examining the collection. 



List of t'^ pedes. 

 Gymnoblastea. 



Family Clavid^e. 



Hhizogeton nudum Brocli (?) 



Family EuDKXDRiD.t:. 



Eudendrium parvmn Warren (?) 



Family Penxakid.e. 



J'ennaria disticha Cold fuss, var. austraHs Bale. 



Family TunuLAiiiD.t:. 



Tubularia crocea Agassiz. 



Calyptollxstea. 



Family Campan'ularid.*:. 



('ampairidaria corrnijaia Tliornely. 

 ('h/ti(i noli for III in MCrady(?) 

 Clytia serrulata Bale. 



* tV)imiiiiiii<'nt('(l liy I.'. Ki i!k i'atku h. F.Z.S. 



